Comparison of cone-beam computed tomography cephalometric measurements using a midsagittal projection and conventional two-dimensional cephalometric measurements
- Authors
- Jung, Pil-Kyo; Lee, Gung-Chol; Moon, Cheol-Hyun
- Issue Date
- Nov-2015
- Publisher
- KOREAN ASSOC ORTHODONTISTS
- Keywords
- Cephalometrics; Cone-beam computed tomography (CBCT); Diagnosis and treatment planning; Reorientation
- Citation
- KOREAN JOURNAL OF ORTHODONTICS, v.45, no.6, pp.282 - 288
- Journal Title
- KOREAN JOURNAL OF ORTHODONTICS
- Volume
- 45
- Number
- 6
- Start Page
- 282
- End Page
- 288
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/9990
- DOI
- 10.4041/kjod.2015.45.6.282
- ISSN
- 2234-7518
- Abstract
- Objective: This study investigated whether it is possible to use a two-dimensional (2D) standard in three-dimensional (3D) analysis, by comparing the angles and lengths measured from a midsagittal projection in 3D cone-beam computed tomography (CBCT) with those measured by 2D lateral cephalometric radiography (LCR). Methods: Fifty patients who underwent both LCR and CBCT were selected as subjects. CBCT was reoriented in 3 different methods and the measuring-points were projected onto the midsagittal plane. Twelve angle values and 8 length values were measured on both LCR and CBCT and compared. Results: Repeated measures analysis of the variance revealed statistically significant differences in 7 angular and 5 linear measurements among LCR and 3 types of CBCT (p < 0.05). Of these 12 measurements, multiple comparisons showed that 6 measurements (ANB, AB to FH, IMPA, FMA, Co-Gn, Go-Me) were not significantly different in pairwise comparisons. LCR was significantly different from 3 types of CBCT in 3 angular (SN to FH, interincisal angle, FUR) and 2 linear (S-Go, Co-ANS) measurements. The CBCT method was similar for all measurements, except for 1 linear measurement, i.e., S-N. However, the disparity between the mean values for all parameters was within the range of clinical measurement error. Conclusions: 3D-CBCT analysis, using midsagittal projection, is a useful method in which the 2D-LCR normative values can be used. Although the measurements changed with reorientation, these changes were not clinically significant.
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